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Subject Test Biology

Question 19 of 24

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SAT Subject Test

The multiple choice questions have five answer choices — one (and only one) is correct in each case.

In a breeding experiment using gray and white mice of unknown genotypes, the following results were obtained.

CHART

If the gray female from cross IV were mated with the gray male from cross II, then which of the following would most likely be true?

Select an Answer

All of the offspring would be gray.

Correct Answer: 
Yes

All of the offspring would be white.

Correct Answer: 
No

Half of the offspring would be gray.

Correct Answer: 
No

One-quarter of the offspring would be gray.

Correct Answer: 
No

One-quarter of the offspring would be white.

Correct Answer: 
No

In cross IV, the gray female parent must be homozygous dominant. In cross II, the gray male parent must be heterozygous. Therefore, all of the offspring from this cross would show the dominant phenotype, gray, choice (A).

Question Difficulty: 
medium